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Explain the sex determination mechanisms...

Explain the sex determination mechanisms in human. How is it different from birds?

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In birds, female has dissmilar chromosomes (ZW) and males have two similaer (ZZ) chromosomes. But in humans, female has homogametic (XY) amnd male has heterogametic (XY) sex chromosome.
In humans, sperm is resopsible for sex of offspring. In birds egg is responsible for the sex of the offsprings.
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